add &subset=latin,latin-ext,cyrillic to Open Sans #17
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Some languages require characters with diacritical marks. Czech language is not rendered properly. Adding latin-ext subset should fix issue for e.g. Czech language and cyrillic for Russian, Ukrainian or Bulgarian language.
More problematic are the special fonts in https://use.typekit.net/ucr7myw.css that need to have latin-ext characters as well since they don't render well for diacritical chars.